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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb566e6859a9b291c2b0493ea785af95dcbc1713ff974a63c35ee0e9daab5ba0' 
  AND token = 'ubHEmB+ZyqQLSDlf/DtbK2UfJY7jTc8Jck/Rhl2+1Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}